Spectacle lens for a display device that can be fitted on the head of a user and generates an image, and display device with such a spectacle lens

Abstract

A spectacle lens for a display device can be fitted on the head of a user and generate an image. A spectacle lens body includes a front side and/or the rear side that are curved, and at least a first and a second partial body, the mutually facing boundary surfaces of which are in direct contact, and as seen in top view onto the spectacle lens, a coupling-in section in an edge area of the spectacle lens and a coupling-out section in a central area of the spectacle lens. The spectacle lens can guide light bundles of pixels of the generated image to the coupling-out section and couple them out of the spectacle lens via the coupling-out section. A flat first reflecting surface and a flat second reflecting surface spaced apart from the first reflecting surface are provided in the spectacle lens body.

The invention claimed is: 
     
       1. A spectacle lens for a display device that can be fitted on the head of a user and generate an image, comprising:
 a spectacle lens body comprising a front side and a rear side, wherein at least one of the front side and the rear side are curved, at least a first and a second partial body, the mutually facing boundary surfaces of which are in direct contact, and as seen in top view onto the spectacle lens, a coupling-in section in an edge area of the spectacle lens and a coupling-out section in a central area of the spectacle lens, 
 wherein the spectacle lens is configured to guide light bundles of pixels of the generated image, which are coupled into the spectacle lens via the coupling-in section of the spectacle lens, in the spectacle lens to the coupling-out section and coupling them out of the spectacle lens via the coupling-out section, 
 wherein a flat first reflecting surface and a flat second reflecting surface spaced apart from the first reflecting surface are provided in the spectacle lens body, which each extend in a direction from the coupling-in section to the coupling-out section and which are each spaced apart from the front and rear side of the spectacle lens body, 
 wherein the light bundles are guided by reflections at the two reflecting surfaces in the direction from the coupling-in section to the coupling-out section, and 
 wherein at least one of the first and second reflecting surfaces is provided in the first or second partial body and is offset from the boundary surface of the corresponding partial body in the direction from the first to the second partial body. 
 
     
     
       2. The spectacle lens according to  claim 1 , wherein the first reflecting surface is provided in the first partial body and spaced apart from the boundary surface of the first partial body and the second reflecting surface is provided in the second partial body and spaced apart from the boundary surface of the second partial body. 
     
     
       3. The spectacle lens according to  claim 1 , wherein the first reflecting surface is provided in the first partial body and spaced apart from the boundary surface of the first partial body and the second reflecting surface is formed at the boundary surface of the second partial body. 
     
     
       4. The spectacle lens according to  claim 1 , wherein the coupling-out section comprises a pupil expander for the light bundles. 
     
     
       5. The spectacle lens according to  claim 1 , wherein the first and second reflecting surfaces are parallel to each other. 
     
     
       6. The spectacle lens according to  claim 1 , wherein, in the coupling-out section, a first deflecting section is formed with a reflective Fresnel structure which deflects the light bundles in the direction of the rear side such that they are coupled out via the rear side. 
     
     
       7. The spectacle lens according to  claim 6 , wherein the second reflecting surface extends into the coupling-out area and the Fresnel structure lies in front of the second reflecting surface, seen in the direction of the light bundles striking the second reflecting surface. 
     
     
       8. The spectacle lens according to  claim 6 , wherein the Fresnel structure comprises several reflective facets which are arranged next to each other in a direction from the edge area to the central area. 
     
     
       9. The spectacle lens according to  claim 8 , wherein the facets are formed as partially reflective facets. 
     
     
       10. The spectacle lens according to  claim 8 , wherein the transparency of the facets decreases in the direction from the edge area to the central area. 
     
     
       11. The spectacle lens according to  claim 8 , wherein, in each case, two directly neighboring facets are connected by a transparent face. 
     
     
       12. The spectacle lens according to  claim 8 , wherein the first reflecting surface extends into the coupling-out area and the Fresnel structure lies in front of the first reflecting surface, seen in the direction of the light bundles striking the first reflecting surface. 
     
     
       13. The spectacle lens according to  claim 12 , wherein the facets are formed on the first reflecting surface and the area between the facets and the first reflecting surface is filled with a material which corresponds to the material of the partial body in which the first reflecting surface lies. 
     
     
       14. The spectacle lens according to  claim 1 , wherein the first and second reflecting surfaces are formed by boundary surfaces of a guide plate which is inserted in at least one of the first and the second partial body. 
     
     
       15. The spectacle lens according to  claim 14 , wherein the guide plate projects laterally from the spectacle lens body, wherein the coupling-in section is formed in the laterally projecting part of the guide plate. 
     
     
       16. The spectacle lens according to  claim 1 , wherein at least one of the first and the second reflecting surface is formed in at least one of the first and the second partial body. 
     
     
       17. The spectacle lens according to  claim 1 , wherein at least one of the first and the second reflecting surface brings about the reflection of the light bundles by total internal reflection. 
     
     
       18. The spectacle lens according to  claim 1 , wherein at least one of the first and the second reflecting surfaces are formed by a reflecting layer. 
     
     
       19. The spectacle lens according to  claim 1 , wherein a second deflecting section, which deflects the light bundles such that they are guided to the coupling-out section by the reflections at the first and second reflecting surface, is provided in the area of the coupling-in section. 
     
     
       20. The spectacle lens according to  claim 1 , wherein at least one of the coupling-in and the coupling-out sections has an imaging effect. 
     
     
       21. The spectacle lens according to  claim 1 , wherein the coupling-in section has a collimation effect. 
     
     
       22. The spectacle lens according to  claim 1 , wherein the coupling-in section is at least one of refractive and reflective. 
     
     
       23. A display device, comprising:
 a holder that can be fitted on the head of a user; 
 an image-generating module secured to the holder, which generates an image; and 
 an imaging optical system secured to the holder, which comprises a spectacle lens according to  claim 1  and which, when the holder is fitted on the head, images the generated image such that the user can perceive it as a virtual image. 
 
     
     
       24. A spectacle lens for a display device that can be fitted on the head of a user and generate an image, comprising:
 a spectacle lens body comprising a front side and a rear side, wherein at least one of the front side and the rear side are curved and the spectacle lens body is formed in one piece, and as seen in top view onto the spectacle lens, a coupling-in section in an edge area of the spectacle lens and a coupling-out section in a central area of the spectacle lens, 
 wherein the spectacle lens is configured to guide light bundles of pixels of the generated image, which are coupled into the spectacle lens via the coupling-in section of the spectacle lens, in the spectacle lens to the coupling-out section and coupling the light bundles out of the spectacle lens via the coupling-out section, 
 wherein a flat first reflecting surface and a flat second reflecting surface spaced apart from the first reflecting surface are provided in the spectacle lens body, which each extend in a direction from the coupling-in section to the coupling-out section and which are each spaced apart from the front and rear side of the spectacle lens body, 
 wherein the light bundles are guided by means of reflections at the two reflecting surfaces in the direction from the coupling-in section to the coupling-out section, 
 wherein the first and second reflecting surfaces are formed by boundary surfaces of a guide plate which is inserted into the spectacle lens body, and 
 wherein the guide plate, in the coupling-out section, comprises a first deflecting section with a reflective Fresnel structure, which deflects the light bundles in a direction of the rear side such that they are coupled out via the rear side. 
 
     
     
       25. The spectacle lens according to  claim 24 , wherein the guide plate projects laterally from the spectacle lens body, wherein the coupling-in section is formed in the projecting part of the guide plate. 
     
     
       26. The spectacle lens according to  claim 24 , wherein the spectacle lens body comprises an end face which connects the front and rear sides and from which a recess extends into the spectacle lens body, wherein the guide plate is positioned in the recess. 
     
     
       27. The spectacle lens according to  claim 24 , wherein the Fresnel structure comprises several reflective facets which are arranged next to each other in a direction from the edge area to the central area. 
     
     
       28. The spectacle lens according to  claim 27 , wherein the facets are formed as partially reflective facets. 
     
     
       29. The spectacle lens according to  claim 28 , wherein the transparency of the partially reflective facets decreases in the direction from the edge area to the central area. 
     
     
       30. The spectacle lens according to  claim 27 , wherein each of two directly neighboring facets are connected by a transparent face. 
     
     
       31. The spectacle lens according to  claim 27 , wherein an area between the facets and the first reflecting surface is filled with material of the guide plate such that the first reflecting surface is formed as a smooth surface in the area of the facets. 
     
     
       32. A spectacle lens for a display device that can be fitted on the head of a user and generate an image, comprising:
 a spectacle lens body comprising a front side and a rear side, wherein at least one of the front side and the rear side are curved and the spectacle lens body is formed in one piece, and as seen in top view onto the spectacle lens, a coupling-in section in an edge area of the spectacle lens and a coupling-out section in a central area of the spectacle lens, 
 wherein the spectacle lens is configured to guide light bundles of pixels of the generated image, which are coupled into the spectacle lens via the coupling-in section of the spectacle lens, in the spectacle lens to the coupling-out section and coupling the light bundles out of the spectacle lens via the coupling-out section, 
 wherein a flat first reflecting surface and a flat second reflecting surface spaced apart from the first reflecting surface are provided in the spectacle lens body, which each extend in a direction from the coupling-in section to the coupling-out section and which are each spaced apart from the front and rear side of the spectacle lens body, and 
 wherein the light bundles are guided by means of reflections at the first and second reflecting surfaces in the direction from the coupling-in section to the coupling-out section, and 
 wherein at least one of the first and second reflecting surfaces is configured to bring about the reflection of the light bundles via total internal reflection.